CdS nanosheets decorated with Ni@graphene core-shell cocatalyst for superior photocatalytic H2 production
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2020年第21期
论文作者：Tingmin Di Liuyang Zhang Bei Cheng Jiaguo Yu Jiajie Fan
摘 要：A novel cocatalyst, i.e. metallic nickel nanoparticles encapsulated in few-layer graphene（Ni@C）, is obtained by carbonization of metal–organic frameworks（MOF） and leaching treatment of hydrochloric acid. It is selected as the cocatalyst for CdS nanosheets, forming CdS-Ni@C nanocomposites. It remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene layers. In addition, the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient, which avoids contamination and curbs corrosion. The larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C, suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole pairs. This strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.
Tingmin Di1，Liuyang Zhang2，Bei Cheng2，Jiaguo Yu2，Jiajie Fan3
1. School of Materials Science and Engineering, Wuhan Institute of Technology2. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology3. School of Materials Science and Engineering, Zhengzhou University
摘 要：A novel cocatalyst, i.e. metallic nickel nanoparticles encapsulated in few-layer graphene（Ni@C）, is obtained by carbonization of metal–organic frameworks（MOF） and leaching treatment of hydrochloric acid. It is selected as the cocatalyst for CdS nanosheets, forming CdS-Ni@C nanocomposites. It remarkably improves the photocatalytic activities of CdS nanosheets due to the synergistic effect of Ni nanoparticles and graphene layers. In addition, the Ni nanoparticles encapsulated by graphene layers effectively isolate Ni from the ambient, which avoids contamination and curbs corrosion. The larger work function of Ni@C and outstanding conductivity of graphene promote the electron transfer from CdS to Ni@C, suppressing the recombination of photogenerated carriers and facilitating the separation of photogenerated electronhole pairs. This strategy by adopting this novel cocatalyst provides a new solution to the improvement of the photocatalytic hydrogen production.
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